Designated by the amount of oxygen (in cubic centimeters) they will absorb, a “500cc” oxygen absorber is the perfect size when using 3 per 5 gallon bucket. 50 oxygen absorbers come in a vacuum-sealed package.
When you are packing #10 cans, buckets, or large mylar bags, you will want to use this size of oxygen absorber. In order to preserve the others in the original package, have your vacuum sealer ready so that you can re-seal the bag after you have pulled out the ones you need.
Read this article to learn more about oxygen absorbers.